My period is now 6 days late and both HPTs have been negative. First test was taken the day of my missed period, the second test was taken last night. Symptoms I've been having include outrageous heartburn, thick vaginal discharge that just started today, very tender nipples but that only lasted a few days, minor headaches, HUGE appetite even shortly after a large meal, and then cramps and backaches like normal PMS symptoms. I am completely thrown off and am frustrated that I keep expectantly using a pad but nothing happens... What gives?